export default {
	namespaced:true,
	state:()=>({
		//购物车的数组，用来存储购物车中每个商品的信息对象
		//每个商品的信息对象，都包含如下6个属性
		//{goods_id,goods_name,goods_price,goods_count,goods_small_logo,goods_state}
		cart:JSON.parse(uni.getStorageSync('cart')||"[]")
	}),
	mutations:{
		addToCart(state,goods){
			const findResult=state.cart.find(x=>x.goods_id===goods.goods_id)
			// console.log(findResult);
			if(!findResult){
				state.cart.push(goods)
			}else{
				findResult.goods_count++
			}
			// console.log(state.cart);
			this.commit('m_cart/saveToStorage')
		},
		saveToStorage(state){
			uni.setStorageSync('cart',JSON.stringify(state.cart))
		},
		//更新购物车中商品选中状态
		updateGoodsState(state,goods){
			const findResult=state.cart.find(x=>x.goods_id===goods.goods_id)
			if(findResult){
				findResult.goods_state=goods.goods_state
				this.commit('m_cart/saveToStorage')
			}
		},
		// 更新商品数量
		updateGoodsCount(state,goods){
			const findResult=state.cart.find(x=>x.goods_id===goods.goods_id)
			if(findResult){
				findResult.goods_count=goods.goods_count
				this.commit('m_cart/saveToStorage')
			}
		},
		// 根据Id删除对应的商品
		removeGoodsById(state,goods_id){
			state.cart=state.cart.filter(x=>x.goods_id!==goods_id)
			this.commit('m_cart/saveToStorage')
		},
		//更新所有商品的勾选状态
		updateAllGoodsState(state,newState){
			state.cart.forEach(x=>x.goods_state=newState)
			this.commit('m_cart/saveToStorage')
		}
	},
	getters:{
		//购物车中所有商品的总数量
		total(state){
			// let c=0
			// state.cart.forEach(x=>c+=x.goods_count)
			// return c
			return state.cart.reduce((total,item)=>total+=item.goods_count,0)
		},
		//购物车中已勾选商品总数量
		checkedCount(state){
			//使用filter方法，从购物车中过滤已勾选的商品
			//再使用reduce方法，将已勾选的商品总数量进行累加
			return state.cart.filter(x=>x.goods_state).
			reduce((total,item)=>total+=item.goods_count,0)
		},
		//已勾选商品总价
		checkedGoodsAmount(state){
			return state.cart.filter(x=>x.goods_state).
			reduce((total,item)=>total+=item.goods_count*item.goods_price,0).toFixed(2)
		}
	}
}